000 00295nam a2200109Ia 4500
008 220204s9999 xx 000 0 und d
082 _a631.8
_bINT
245 0 _aOptimizing yields: The role of fertilizers
260 _aSwitzerland
_bInt Potash Inst
_c1982
650 _aFertilizer use
942 _cBK
999 _c38803
_d38803